RIO DE JANEIRO -- Juan Martin del Potro bounced the ball, waiting to try to serve out his second-round match at the Olympic tennis tournament.Argentine fans sang for him. Brazilians chanted for his opponent, seeking to drown out their rivals. Boos and whistles and shushes echoed around center court.Please, the chair umpire said into his microphone, imploring spectators for some quiet.There has been little of that at the Olympic Tennis Center in Rio de Janeiro. While crowds are sparse for many sports, theyve been healthy for tennis -- and often far louder than the number of folks in the stands would suggest.Wimbledon, this is not.Its different when you play in Europe -- the people are more calm, Brazilian player Thomaz Bellucci said. In Brazil, people get crazy, and its very nice.Jeering is common, and fans often yell out in the middle of a point or as a player is about to serve -- no-nos in tennis.Sometimes we dont know exactly when its OK to cheer, acknowledged Mauricio Vieira, a 40-year-old Brazilian fan who attended del Potros first-round match against top-ranked Novak Djokovic. You have to understand, our point of reference is soccer.And that point of reference is to be raucous -- all the time.We are not used to these kinds of sports, so we watch it as we know it, said 34-year-old Vanessa Pessoa, who works in project management. We make a lot of noise because its who we are.Players have mostly enjoyed the atmosphere, even when its gone against them. Some of the loudest roars so far came on the second-largest court, where the Brazilian doubles team of Bellucci and Andre Sa upset second-seeded brothers Andy and Jamie Murray of Britain in the first round Sunday.It beats playing in front of two men and a dog, said Jamie Murray, whose regular doubles partner, Bruno Soares, is Brazilian.Other than rooting for Brazilian players and against Argentines -- as del Petro experienced in his first two matches -- the home fans can be unpredictable in their allegiances. The objects of their cheers and jeers can shift from set to set, game to game and even point to point.They play with the players: If you win the point, they start screaming, Bellucci said after his first-round singles match.They seem to like the big names, but also underdogs. They love showmanship and, perhaps not surprisingly, passion. Serena Williams earned her biggest roars in her first-round match for her loudest bellows of Come on! But when she smashed a racket in her second-round match, boos rained down.Its different than your average tennis crowd, Williams said. I like it.In sister Venus first-round match, the crowd swung to the side of her diminutive opponent, 61st-ranked Kirsten Flipkens of Belgium, stoked by her drop shots and her will to rally from a big deficit.Goosebumps all over the place, from the first to the last second, Flipkens said.They just enjoyed my game because, I think, Im a little girl trying to do some special stuff to get a chance to beat a champion like that, she added.During that match, some spectators tried to start a U-S-A! chant that was quickly drowned out by boos. The Brazilian crowd directed some of its loudest derision toward Belluccis first-round opponent, Dustin Brown, the dreadlocked German whos typically a fan favorite.But when Brown twisted his ankle and then tried to play through the injury, cheers poured down from the stands.Bellucci said he had never experienced anything like the atmosphere that day on center court. Home matches in Davis Cup -- the head-to-head competitions between mens national teams -- generally draw 2,000-3,000 fans, Bellucci added.Even non-Brazilian players have little to compare this to. The only similar setting Flipkens could remember in her career was the 2006 Fed Cup final -- the womens national-team competition -- that Belgium hosted.Frances Jo-Wilfried Tsonga, who had the crowd both for and against him in his first-round win, said the atmosphere was far livelier than at the 2012 London Olympics.They give us emotions, so thats good, he said.Rio hosts a clay-court tournament in the winter that draws a handful of top players. At the Olympics, though, many spectators seem to be novices at watching tennis -- but not at sports fandom.Who is not shouting has problems. Its too much fun, said Clarisse Lopes, a 30-year-old psychologist attending her first pro tennis tournament. Its not every day we get to see a Djokovic or Serena Williams play in our country. This is such a treat, and we dont have a better way of expressing it.---AP Tennis Writer Howard Fendrich and Associated Press writer Adriana Gomez Licon contributed to this report.Taylor Rapp Youth Jersey .ca NFL Power Rankings, overtaking the Denver Broncos and remaining ahead of NFC competition San Francisco, Carolina and New Orleans. Eric Dickerson Jersey . Now, with Game 6 set for Fenway Park and an 8:07 p.m. ET first pitch, the Detroit Tigers face the unenviable task of having to beat the Boston Red Sox twice, on the road, to advance to the World Series. http://www.footballramsshop.us/authentic-andrew-whitworth-rams-jersey/ . -- Kyrie Irvings last-minute 3-pointer helped seal another victory for Cleveland -- and the Cavaliers longest winning streak since LeBron James left. Greg Gaines Youth Jersey . The 18th player to shoot 60 on the tour, Jamieson settled for par on the final hole when his 15-foot birdie chip grazed the edge of the hole and stayed out. 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Oliver said Friday the coaching change led to him leaving the program and coming to Nevada.I think he was focused tonight and he took really good shots and he got into a rhythm and they had absolutely no answer for him at all, Nevada head coach Eric Musselman said.Oliver added seven rebounds.Nevada shot 48 percent from the field. Oregon State (2-2) shot 46 percent.Tres Tinkle led Oregon State (2-2) with 16 points on 7 of 16 shooting. Beaver forward Gligorije Rakocevic scored 10 points with seven rebounds.Were young, Oregon State head coach Wayne Tinkle. We have to understand our scouting report and execution. Those are things we got to get better at. Weve got a lot of guys that havent played any college basketball. We have one senior. But thats really no excuse.Nevada outrebounded Oregon State, 37-32. Wolf Pack forward Jordan Caroline led all playeers with 12 rebounds.dddddddddddd.Nevada guard D.J. Fenner added 17 points.The Wolf Pack jumped out to a 10-4 lead before the first timeout and stretched its lead to 22-10 with 10:32 in the first half when guard Marcus Marshall found Oliver racing toward the basket on a fast break, which he finished with one of his several dunks.On Nevadas final possession of the first half with seven seconds on the clock, Marshall dribbled off the inbound, stopped about eight feet behind the three-point line and converted on yet another Nevada field goal as the first half ended.After entering the break down 23 points, Oregon State failed to cut the deficit under 21 points in the second half.I thought our intensity from the opening tip was really, really good, Musselman said.BIG PICTUREOregon State: After turning the ball over 27 times in a 63-60 upset loss at home against Lamar, Oregon States struggles continued at Nevada. The Beavers will look to bounce back Tuesday at Tulsa.Nevada: Nevada won one of its most high-profiled out of conference home games of the season and looks to continue that momentum as one of eight teams in the Great Alaska Shootout beginning Sunday with a tournament home game against Iona.UP NEXTOregon State goes to Tulsa for a game Tuesday.Nevada stays at home to face Iona on Sunday night. ' ' '